Here is the full list of all 19 Courage for a Kiss achievements.
Well... You messed up
Finished Jennifer's route
Finished all four routes!
Started Jennifer's route
Finished Amelia's route
Started Amelia's route
A gun appeared on stage!
Anything that could go wrong, went wrong
Sided with Evelyn
Finished Stella's route
Started Stella's route
Finished Evelyn's route
Finished the game for the first time!
Started Evelyn's route
Finished Act Two
There's nothing we could do about it
Finished Act One
Sided with Jennifer
Started the game